Calculate the minimum thickness of a magnesium-fluoride coating ( ) on a glass lens (…

PHYSICS · Subjective · CBSE · Physics · Wave Optics · Wave Optics

Problem

Calculate the minimum thickness of a magnesium-fluoride coating (

n=1.38

) on a glass lens (

n=1.50

) that first minimizes reflection for

550\,\text{nm}

light incident at

45^{\circ}

in air. Give your answer in nanometres.